Find a package that works with your outdated requirements

pkg_search.py

# Search pypi to find a package old enough to work with your requirements

import requests
import json
import re

from packaging import version

packageName = 'dask'
subPackageName = 'pyyaml'
desiredVersion = '5.1.2'

url = 'https://pypi.org/pypi/{}/json'

pkginfo = requests.get(url.format(packageName)).json()
releases = sorted(pkginfo['releases'].keys(),reverse=True)

# step through all releases
for k in releases:
  print("Checking release ", k)
  url = 'https://pypi.org/pypi/{}/{}/json'
  data = requests.get(url.format(packageName, k)).json()
  subPackages = data['info']['requires_dist']
  
  for p in subPackages:
    # is this the package we are looking for?
    if re.search(subPackageName.upper(), p.upper()):
    # extract version number - fails on versionless packages
      thisVersion = re.search(r'[\d\.]+', p)
      if thisVersion:
        if version.parse(thisVersion.group()) > version.parse(desiredVersion):
          print("Found ", thisVersion.group(), " which is too new")
        else:
          print("Found ", thisVersion.group(), " which is old enough")
          exit()
      else:
        print("No version specified, but it might work")
        exit()